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• Past Uses of the Site Based on information reviewed for the Surface & Subsurface Contamination Report (Live Oak, 2016), the Site has been orchard since 1937 or earlier. The house was built in 2002 or 2003, and the barn was built eight years ago. Existing and Proposed Septic Tank Usage Existing Septic System Two septic systems are currently located on the Site, one for the house and one for the apartment above the barn. Proposed Septic System No new construction is planned. On-Site Septic Permit History Live Oak searched the septic system permits on file at the San Joaquin County Environmental Health Department; two septic permits were identified for the Site addresses. • • October 2003 permit for new septic system at house. The system utilizes a 1,600-gallon tank, two 60-foot leach lines, and four 42-inch diameter by 25-foot deep seepage pits (6100). • September 2008 permit for new septic system to serve barn/apartment. The system utilizes a 1,200-gallon tank, two 40-foot leach lines, and two 36-inch diameter by 25-foot deep seepage pits (6350). These permits are included in Appendix 4 of this report. Existing Septic Tank Usage in the Vicinity To estimate the existing septic system usage in the area, our office counted septic systems located within approximately one square mile surrounding the property. Aerial imagery from Google Earth was used. Each building cluster on the photograph was assumed to have one septic system. Using this method, it is estimated that 16 or more septic systems per square mile are present in the immediate vicinity of the Site. The general area consists of orchards and open, agricultural land with scattered rural residences along the roadways. Septic Permit History in the Vicinity • Based on a review of septic permits on file at the San Joaquin County Environmental Health Department for nearby properties, it appears that most septic systems in the LOGE 1710 Page 2